Delirium is a serious disturbance in a person's mental abilities that results in decreased awareness of one's environment and confused thinking. Symptoms include an inability to remain focused, wandering attention, getting stuck on an idea, being easily distracted, being withdrawn, disorientation, rambling or nonsense speech, and hallucinations. Delirium can be cured by treating the cause of it. In EU's case, he was severely and acutely dehydrated, which led to his delirium.